<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Template</title>
</head>
<body>

<div id="app">

    <!-- 1. 直接在标签上进行if判断 -->
    <h2 v-if="score>=90">优秀</h2>
    <h2 v-else-if="score>=80">良好</h2>
    <h2 v-else-if="score>=60">及格</h2>
    <h2 v-else>不及格</h2>

    <h1>{{result}}</h1>
</div>

<script src="../js/vue.js"></script>
<script>
    const app = new Vue
    (
        {
            el : "#app",
            data : 
            {
                message: "hello",
                isShow : true,
                score : 99,
            },
            computed :
            {
                // 2. 使用计算属性
                result ()
                {
                    let showMessage = '';
                    if(this.score >= 90)
                    {
                        showMessage = "优秀";
                    }else if(this.score >= 80)
                    {
                        showMessage = "良好";
                    }else if(this.score >= 60)
                    {
                        showMessage = "及格";
                    }else
                    {
                        showMessage = "不及格";
                    }
                    return showMessage;
                }    
            }
        }
    )
</script>
    
</body>
</html>